External extension H2
The external extension is connected
to the boiler control unit via the KM
BUS. The following functions can be
controlled or processed simulta-
neously via the extension:
sK
DHW circulation pump
fÖ
Power supply
aVD
&
External blocking
(terminals 2 - 3)
&
External demand
(terminals 1 - 2)
&
External operating mode chan-
geover (terminal 1 - 2)
The allocation of the "External
heating program changeover"
function is selected via coding
address "91".
aVG
KM BUS
Extensions for external connections . . .
(cont.)
99
Function description
5692
569
GB
Summary of Contents for Vitodens 300
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